# How to get three nested enumerations in LaTeX?

This is my current code. I've managed to get one next enumeration but I want a third nesting to replace me having to write 1.1.1, 1.1.2 etc.

 \begin{enumerate}
\item Top Levek
\begin{enumerate}
\item Second Level
\begin{enumerate}
\item Third Level
\end{enumerate}
\end{enumerate}
\end{enumerate}


This gives me

1 Top Level
1.1 Second Level
i Third Level


My desired output is

1 Top Level
1.1 Second Level
1.1.1 Third Level


How do I achieve this?

Also, how do I remove the indentation on the third level so it is inline with the second level?

• Welcome to TeX.SX! Ehen you post a question it's better to give a complete minimal working example. This should be as small as possible to demonstrate your problem and compile. This both clarifies your question and makes it easier to help you! – Andrew Oct 29 '18 at 9:56
• Welcome to TeX.SE. Please tell us if your document loads any packages that influence the appearance of numbers used in enumerations. For sure, the LaTeX default for second-level enumerated items is (a), (b), etc., not 1.1, 1.2, etc. Please also advise whether or not second-level enumerated items should be left-indented with respect to first-level enumerated items. – Mico Oct 29 '18 at 9:56
• What should be inline with the second level? The label or the texts that follow the labels? – Bernard Oct 29 '18 at 10:16
• @Bernard the answer given is what I was looking for. However, if you know how to get both the labels in line with each other and the text in line with each other also that'd be great. – Maria Robson Oct 29 '18 at 10:43
• If you'd asked for this alignment of the labels in the OP then that's what I would have given... – Andrew Oct 29 '18 at 13:51

Is it this alignment you wish?

\documentclass{article}
\usepackage{enumitem}
\usepackage[showframe]{geometry}

\newlength{\labelwd}
\settowidth{\labelwd}{9.9.9}
\setlist[enumerate]{label*=.\arabic*, wide = 0.5em, labelwidth=\labelwd}
\setlist[enumerate, 1]{label=\arabic*}
\setlist[enumerate, 2,3]{labelindent=-\dimexpr\labelwd+\labelsep}

\begin{document}

\begin{enumerate}[leftmargin=\dimexpr\labelwd+\labelsep + 0.5em,]
\item Top Level. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text.
\begin{enumerate}
\item Second Level. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text.
\begin{enumerate}%[labelindent = -\dimexpr1cm + \labelsep]
\item Third Level. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text. Some more text.
\end{enumerate}
\end{enumerate}
\end{enumerate}

\end{document}


You can use the enumitem package to produce:

Here's the code:

\documentclass{article}
\usepackage{enumitem}
\setlist[enumerate,1]{label=\arabic*}
\setlist[enumerate,2]{label=\theenumi.\arabic*}
\setlist[enumerate,3]{label=\theenumii.\arabic*}
\begin{document}

\begin{enumerate}
\item Top Levek
\begin{enumerate}
\item Second Level
\begin{enumerate}
\item Third Level
\end{enumerate}
\end{enumerate}
\end{enumerate}

\end{document}


The important bits are the lines

\usepackage{enumitem}
\setlist[enumerate,1]{label=\arabic*}
\setlist[enumerate,2]{label=\theenumi.\arabic*}
\setlist[enumerate,3]{label=\theenumii.\arabic*}


These specify what you want the labels to look like. I highly recommend reading the package manual if you need to tweak further. It's very to easy to read.

Edit TO get the indentation in the OP you can use:

\documentclass{article}
\usepackage{enumitem}
\setlist[enumerate]{
leftmargin=0pt, labelindent*=0pt, labelwidth=0pt,align=left
}
\setlist[enumerate,1]{label=\arabic*}
\setlist[enumerate,2]{label=\theenumi.\arabic*}
\setlist[enumerate,3]{label=\theenumii.\arabic*}

\begin{document}

\begin{enumerate}
\item Top Level
\begin{enumerate}
\item Second Level
\begin{enumerate}
\item Third Level
\end{enumerate}
\end{enumerate}
\end{enumerate}

\end{document}


to give:

EDIT II As Mico says in the comments, for the required indentation it is easier to use \setlist[enumerate]{ wide=0pt }.

• Why not use \setlist[enumerate]{label*=\arabic*.} instead? – leandriis Oct 29 '18 at 9:59
• This solution doesn't address the OP's objective to "remove the indentation on the third level so it is inline with the second level". – Mico Oct 29 '18 at 10:10
• @leandriis - The OP has stated that he/she does not want a period (aka "full stop") at the end of the numeric labels. – Mico Oct 29 '18 at 10:11
• @leandriis Thanks for that. I did not know about label*! – Andrew Oct 29 '18 at 10:15
• Simpler than leftmargin=0pt, labelindent*=0pt, labelwidth=0pt,align=left is wide=0pt. – Mico Oct 29 '18 at 10:18

If you don't want to use a new package, you can define new list environnement.

With my ugly solution, if you write nothing after an item and you open a new list just after, the numbers appears only one time, like show here:

LaTeX render this very well, but I do it without any care.

Here is the code:

\documentclass{article}

\newcounter{123num}
\newenvironment{123item}
{\begin{list}{\textbf{\arabic{123num}}}
{\usecounter{123num}
\setlength{\leftmargin}{1.4em}
}}
{\end{list}}

\newcounter{sous123num}
\newenvironment{sous123item}
{\begin{list}{\textbf{\arabic{123num}.\arabic{sous123num}}}
{\usecounter{sous123num}
\setlength{\labelwidth}{1.8em}
\setlength{\leftmargin}{0.9em}
}}
{\end{list}}

\newcounter{soussous123num}
\newenvironment{ss123item}
{\begin{list}{\textbf{\arabic{123num}.\arabic{sous123num}.\arabic{soussous123num}}}
{\usecounter{soussous123num}
\setlength{\labelwidth}{2.7em}
\setlength{\leftmargin}{0.9em}
}}
{\end{list}}

\begin{document}

\begin{123item}
\item Top Level
\begin{sous123item}
\item
\begin{ss123item}
\item Third Level
\end{ss123item}
\item Second Level
\end{sous123item}
\end{123item}

\end{document}